I guess the mail app is not "most programs" I cannot get this combo to work. Only the first email I clicked on gets ticked

Anyone know how I can select ALL and have all the emails listed "ticked" for deletion or to move? I see there is a "tick" button, but then you have to manually select each one...

I just want to know if I upgrade from W7 to W10 will all of my applications be removed (eg. do I have to re-install all my apps)?