Nav mesh navigation doesn't work after open a level

Hello, I’m using Unreal Engine 4.26 to make a top down character game (I’m using the top down template). When I executed the game in a standalone window, the character moved and the navmesh worked. But, a few days ago I did another level to put the main menu of the game, in the start button it opened the main level (the top down template map), but when it loaded, the character could’nt move, so it’s a problem with the navmesh bound. I tried severals ways to solve it and I’ve read lots of forums with the same question, but it didn’t worked for me. I also tried it in 4.27 version, it works when I play in the editor, but when I compile the game or I play it in a standalone window, it doesn’t work. I hope you could help me. Thanks.