How to view all specific transactions by category (so no other transactions appear)

The way I would do it is Data>Create a Filter - then click on the little symbol to the right of Category. in the box that drops down, click on ‘clear all’ and then type in Restaurants in the box just below ‘clear all’.

That will give you Restaurants and nothing else.

And, welcome to the community!!

p.s. There is also a tab called Transaction Tracker that is perfect for tasks like these. It’s fast and versatile and easy. You might want to check it out.