Can't make app open in full screen

I have been using CCleaner for many years. I just installed v7. When I open it, I get a window that occupies the center of the screen and only fills about 1/3. There is no way to go full screen. When I move the window, there is another window underneath with controls to go full screen, but it is greyed out and won’t open. CCleaner is totally useless.

It’s probably ypur display resolution and magnification.

Try setting them to ‘Standard’ and 100% while you get past the CCleaner install screens and then putting them back how they were.

If that doesn’t do the trick then if you could tell us your resoultion / magnification and post a screenshot of what you are seeing we should be able to give further help.

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Thanks for quick reply. I was able to use the window and arrows to start a scan, and once I did that I was able to open CCleaner V. 7 full screen. I still could not see all information. I was running at 2048x1080,100%. At your suggestion I went to 2560 x 1440, and 125%, and now see the whole screen. I was running V. 6 and V. 7 at the same time, so I uninstalled V. 6. Fingers crossed.