ProjectSettings/PixelateProSettings.asset, so you can commit them and share them with your team. Check for Updates On Startup and Show Previews in Project Window are stored for you only and apply to every project on this computer. The export settings are defaults for new Pixelate Assets; existing assets keep their own values.
To put everything back, open the page menu (the button at the top right of the page) and choose Reset to Defaults.
General
New Pixelate Assets
These apply whenever you create a Pixelate Asset: from Create > Pixelate > Pixelate Asset or from the Browser, empty or from a selected model or prefab.Pixelate Browser
The Project window’s own Create menu always uses the folder you clicked in, whatever this setting says.