When the minus key is pressed, it completes the selected code in the code completion window.

you write a bootstrap class in html or in php 
Imagine that there is a variable named th.

You want to type mt-5 but when you type mt and do - php storm runs the completion in the open window. this is ridiculous and I want to disable it. my code completion window only completes the code with tab or enter.

or consider this

When writing php

Imagine you would type $th->service

If you type $th and do -, it will write $this-> on the screen.

Example Video : https://youtu.be/m8ocbHtznxU