The state has recorded more than 1,000 new coronavirus cases for the fourth straight day.
There were 1,036 new cases reported Saturday. There were Friday the state saw 1,253 new cases, followed by Thursday with 1,051 new cases reported.
The Indiana State Department of Health confirmed a total of 74,328 positive coronavirus cases in the state, including 2,835 deaths. There have been 828,466 tests conducted, with an 8.8% total positivity rate. The seven-day positivity rate is 7.5%.
The state will remain in Stage 4.5 until Aug. 27. Local governments can impose more restrictive guidelines.
"This virus will take what we give it, so it is incumbent upon us to be on our best behavior, practicing physical distancing, good hygiene and masking up," Holcomb said.
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The executive order also extends the moratorium on evictions from rental properties and the prohibition on filing foreclosures through Aug. 14.
The mandatory mask order for schools has also been modified to allow students to remove masks for classroom instruction when they are able to maintain at least 3 to 6 feet of distance between students, based on health officials' guidance.
A central Indiana school has shut down two days after opening after at least one staffer tested positive for COVID-19.
Other districts in the state also are reporting positive coronavirus tests among students and employees.
The Indianapolis Star reports that Elwood Junior Senior High School is temporarily closing this week. Several other people are in quarantine.
The district says no students were believed to have been in close contact with the staff members.
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Schools Superintendent Joe Brown said after an emergency school board meeting Saturday that "all of these individuals were tested prior" to the start of the school year.
At least one other student and one school staff member also tested positive for the virus just days after public schools around Indiana reopened.
In the Greenfield-Central Community School Corporation, a student tested positive for the virus on the first day back to class.
Superintendent Harold Olin told The Associated Press that the student attended school for only part of the day.
People who came into close contact with the student will have to quarantine before returning. At Avon High School, a staff member tested positive, however, the district says that person had not been at school that week.
The district started its academic year at the beginning of August. Students were slated to receive instruction virtually for the first week before resuming their normal schedules.
The Will County Health Department in Illinois said contact tracers determined that multiple people who attended a private high school prom held in Northwest Indiana have now tested positive for COVID-19.
Officials said they determined nearly 300 people, including high school students and chaperones, attended the event from more than one high school in that area.
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White House health advisor Dr. Anthony Fauci says he's concerned about the Midwest reopening, especially in states like Indiana, Ohio, Tennessee and Kentucky.
Those states are "starting to have" a "very early indication" of rising COVID-19 positivity rates, which is a "surefire sign that you've got to be really careful," Fauci told ABC News chief anchor George Stephanopoulos on "Good Morning America" recently.
The director of the National Institute of Allergy and Infectious Diseases urged states to reopen in a manner consistent with the federal government's guidelines for reopening.
Some municipalities have closed down beaches frequented by those on the Illinois side of the border.
Watch full GMA interview with Dr. Anthony Fauci, NIH Director, National Institute of Allergy and Infectious Disease
A statewide face mask mandate is also in effect, however, Holcomb has backed down on the idea of imposing fines or criminal penalties on those who don't comply with the order.
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"I think he did the right thing because you know sometimes certain laws get abused," said East Chicago resident Wayne Morris.
Gov. Holcomb says he hopes to enforce compliance through education.
The statewide face mask order applies to anyone ages 8 and older in any indoor public or business areas and at outdoor public spaces when sufficient distancing can't be maintained.
Masks aren't required for people with specific medical reasons or for people who are doing strenuous physical activity. Eating and drinking is also an exception.
The state's attorney general believes the governor has overstepped his authority in issuing a statewide face mask mandate and that only the Legislature can make violations a criminal offense. Republican Attorney General Curtis Hill issued an advisory opinion, just hours after Holcomb announced the mask order to help slow the coronavirus spread. The opinion, however, did not block the governor's action. Hill is on his way out of office after failing to win the Republican nomination for reelection following allegations that he drunkenly groped four women.
The Republican leader of the state Senate praised Holcomb's decision to drop the possible misdemeanor offense.
The Associated Press contributed to this report.