The following part introduces how to fix the Snip and Sketch tool not covering the whole screen issue.
Press theWindows+Ikeys together to openSettings.
Go toSystem>Display>Scale & layout.

In theScalepart, smack the drop-down menu to change the scale level.
Thus, you’re able to change the second monitors resolution.
Here is how to do that:
2.

Go toSystem>Display>Scale & layout.
Under theDisplay resolutionpart, you might change the second monitors resolution.
You may want to use multi-screen on Windows 11.
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However, you may encounter the Windows 11 not detecting second monitor issue.
you gotta wrap up the tool and relaunch it.
Go toApps>Installed apps.

Find Snipping Tool and right-nudge the three-dot next to it to chooseAdvanced options.
And you’ve got the option to use MiniTool ShadowMaker to back up your files to protect them.