It seems like the window is opening on the wrong screen and you have to drag it to your visible primary screen.
Can you please try the following steps:
– hover your mouse on the task bar icon of the app
– once the small preview window show up on top of the task bar icon, right click it and select “Move” on the context menu
– try to move it by clicking the left or right arrow key continuously (depends on which side the window is located), to drag the window to your primary/visible screen.
For assistance, please check the screenshot attached.