How do you create a Tool Icon?

Some free model tools have a icon like this:
Screen Shot 2021-10-20 at 3.47.38 PM
How do I create it? I don’t really like it like this:
Screen Shot 2021-10-20 at 3.47.41 PM
I’ve noticed they have a 'thumbnail camera inside the tool, yet I am not sure what it does.

Hello you need to open Properties in Roblox Studio, then change the thumbnail for your gear :

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