My video seems to small?

I really don't know why but I can't work comfortably, i can't get the way to make the video larger, in every tutorial i see appears to work properly but my pc.
any thoughts ?

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are you using high dpi displays ?

I am and windows was blowing the resolve UI up a lot.

modified my shortcut target to use:

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -WindowStyle Hidden "$Env:QT_DEVICE_PIXEL_RATIO=1;$Env:QT_AUTO_SCREEN_SCALE_FACTOR=2;start 'C:\Program Files\Blackmagic Design\DaVinci Resolve\Resolve.exe'"

And resolve loaded in native 4k.... admittedly it's not perfect.
A lot of the text is really bloody tiny, but you get a lot more screen real-estate as a result of the native res.

If you are not working on a high dpi display, what is your screen resolution? This has a bearing on what you can see on screen. This is what the Color page on a 1920x1080 display looks like.

Your screen is too small.

I recommend the following minimums.

24" @ 1080
27" @ 1440
32" @ 2160