Others have written to simply right-click the plugin to install, and then "Uninstall" will show up. But for me, right-clicking does nothing.
Try the Installed
tab instead of the Marketplace
.
Here's the official tutorial: https://www.jetbrains.com/help/idea/managing-plugins.html#remove-plugin
In the Settings/Preferences dialog ⌘,, select Plugins.
Open the Installed tab and find the plugin that you want to remove.
Click The down arrow next to the Disable/Enable button and select Uninstall from the dropdown menu.