Wimbledon will stage matches on its traditional rest day on the middle Sunday of the tournament from 2022.
The Grand Slam will instead be played over 14 consecutive days, with All England Lawn Tennis Club chairman Ian Hewitt saying this was possible because of better grass-court maintenance.
Organisers also revealed they are hoping to have fans at a minimum of 25% capacity this year.
Ticket prices will stay at 2020 levels, with prize money yet to be decided.
"We plan to deliver the best Championships possible in accordance with public safety. It will necessarily be different from Wimbledon as we know it," Hewitt said.