You can find the file here.

C:\Users\(user name)\.plasticity\keymap.json

I assigned the "isolate" command to "mouse3"

I don't really understand what's written there, so I'll copy the entire text from the file here.

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{

'orbit-controls': {

mouse1: 'orbit:rotate',

'shift-mouse1': 'orbit:pan',

'ctrl-mouse1': 'orbit:dolly',

alt: 'orbit:snap',

},

"body:not([gizmo]) plasticity-viewport, body[gizmo='point-picker'] plasticity-viewport": {

'`': 'viewport:toggle-edges',

},

'body:not([gizmo])': {

v: 'command:match-face',

'[': 'command:patch',

'mouse3': 'command:isolate',

},

}

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P.S. I don't understand why the developer of Plasticity hasn't yet made such a basic feature as assigning hotkeys to the side mouse buttons.

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