How do I disable these popups in IntelliJ that show up after almost each interaction with IDE?
These popups appear if I minimize a tab or start tomcat or execute any code or start debugger, etc. I tried unchecking all options in Preferences > Appearance & Behavior > Notifications but they still appear.
I am using IntelliJ IDEA 2018.2.1 (Ultimate Edition) Build: 182.3911.36

Looks like you have the Key Promoter Plugin (or, less likely, the Key Promoter X Plugin) installed.
You can disable/uninstall this plugin from
Preferences > Plugins.Here's a screenshot (note the
Uninstallbutton on the right hand side):