Question fullscreen became smaller than real screen

[turtle99]

picture

Hi,
I have a strange problem with the game Destiny 2.
I lowered the resolution while in fullscreen and it became smaller
This did not happen before. Only started a few days ago

Does not happen with other 3d games.
Already tried changing drivers

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lenovo y50, laptop
windows 7, 64 bit
meets system requirements
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Thank you in advance

 

[helpstar]

press alt + tab and once again alt+tab
eventually alt + return while ingame

 

[turtle99]

Thanks, I tried that but no change.