How to disable or change an application's shortcut?

I have an app (Skitch) that has a seemingly unchangable shortcut of command-shift-5 for capturing the screen. I'd like to disable this or, at least, change it to another shortcut.

Previously I could go to System Preferences > Keyboard > Shortcuts > App Shortcuts and add an app with its accompanying shortcut there. For example, I tried to change it to the following:

Unfortunately in this instance command-shift-5 retains its function whenever the app is open and in the background in Catalina.

Skitch appears to capture this keyboard setting even when the key binding is disabled for the normal macOS keybinding for "Screenshot and recording options":

Is there a way to stop Skitch from receiving this shortcut and/or assigning it another shortcut that works?

Solution 1:

I had the same problem and solved it by changing the key combination of my Mac.

To change the shortcut, you must click directly in the column of the key combination. Then it will change to an input field. Now click the new key combination on your keyboard, and your mac will change the key combination for this shortcut.

UPDATE: It is also possible to change the key combination of Skitch. See the last option in my screenshot, "App Shortcut".

Solution 2:

shift-command-5 is a macOS keyboard shortcut, not any particular application like Skitch.

Change or disable it in System Preferences → Keyboard → Shortcuts → Screenshots.