Hide Ghost UI Elements

I have a self hosted Ghost version: 5.7.0, and I want to hide/remove some elements from the Ghost UI.

It will be ideal if I can hide it for Staff level - Authors.

Is there any way I can achieve this by editing some template file? So far I am unable to find any template files or anything related to that.

It will be helpful if anyone can point me to the right file to edit.
Thanks in advance.