In case you run into issues using Prepros, there are a couple things you can look into first.
Prepros watches all of the files in your project folder by default, This is fine for small projects but can cause performance issues and Prepros can feel laggy if you have a large project with a lot of files. You can ignore files and folder that do not need to be compiled and reloaded automatically by right clicking them in the file tree.
Notifications not showing up on Windows
First you have to disable both "Do Not Disturb" and "Focus Assist" modes on your computer then enable notifications from the Settings app.
Trouble starting Prepros
In case you are having trouble starting Prepros, you can delete one of the following configuration folders depending on your OS to reset all Prepros settings.