Remove Left Click in Top-Down template

i am totally new to Unreal Engine that’s probably why I’m having this problem.
I created a top-down project which let you move with mouse left click. I removed it, set WASD for movements and it works but only if at the beginning of the game I left click at least once.
Any suggestion how to remove it?

When you left click, the window is now active and can start receive the keyboard input. Which by mean, when you launch the game via editor the window is not active automatically - which is a bug me think.