I don't see drop-down menus

[Underscore]

Hi everyone, when I select from the choose file button the program opens the mac finder.
I've tried reinstalling google chrome, videostream, and many other tests.
The chromecast works with all applications, youtube etc.
But if I do a screen share and then stop it and then click on the file tab, I choose the file and it works.
My problem is getting it back to normal.
Thank you all!