In Bambu Suite when selecting your material, the material library menu pops up. If the material you want to work on is not present, you can click on “more” and search for it. After you have clicked on it in that menu, it from then on appears in the first menu of materials..
So that way one can add (preset) materials. Adding custom materials works fine too, as well as removing them.
But how do I remove (preset)materials from the library I rarely/never use (or accidentally added via the way as explained above) to keep things more organized?