Theme

Open Settings ▸ General and look under Appearance. The Theme option lets you choose how Brolla looks: Dark or Light — “Choose how Brolla looks.” Pick whichever is easier on your eyes.

You don’t have to come back here to switch, though. As the hint notes, you can “Toggle anytime with ⌘⇧D / Ctrl+⇧D” — a quick way to flip between dark and light while you work.

Language

Still under Appearance, the Language option lets you run Brolla in English, Français or Español. Choose your language and the app’s labels and messages switch to match.

How Brolla opens

Under the Library section you can shape how Brolla starts each time:

• Auto-open last library on launch — turn this on and Brolla reopens the library you used last, so you’re straight back to work.
• Sidebar at launch — choose Expanded to see the full sidebar on start, or Collapsed for a roomier view. You can always toggle the sidebar later with ⌘B.

When you’ve made your choices, click Save to keep them.