Need help with just set sound in game

Hi.

I need set up sound in my game. I set up music on game level load. It ok with level sound.

On game start loaded widget, and music start with widget created. This is sound 2d UI. Then when widget closed, this music continue play with level music.

I found Sound 2d impossible stop. I try several tricks, useless. Any advice appreciated.

I need just start and stop sound on demand. Same with video assets.

I work in Unreal Engine 4.27