Wendy, you're very close. I love the Custom toolbar. Look for the tiny + (plus sign) on the far right. It opens up all the available choices. As it prompts, just hold down CTRL and drag the icons you want into the Custom toolbar.

TIP: My favorite buttons are Save As, because it gets you to the options easier, and Notation, because it toggles between the Chordsheet Mode and the Notation Mode. If it helps, here are the ones I have in Custom:

Notation, New, Open, Save, Save As, MIDI, Print, Settings, Prefs, Form, Freeze. With just these, I can do almost everything I need. Of course, it's called Custom because everyone's needs and preferred method of working will differ.

BIAB 2024 Win Audiophile. Software: Studio One 6.5 Pro, Swam horns, Acoustica-7, Notion 6; Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus Studio 192, Presonus Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors