A new site already looks like a gallery with the White Cube preset. These steps make it yours. All of them are on the site's Theme › Edit theme settings page, or in Customize if Design Studio is installed.
1. Choose a preset
Under Style preset, pick White Cube, Salon, Kunsthalle, Atelier or Darkroom. A preset sets the colors, fonts, header layout, grid and hanging together. Settings left at "Use preset" follow it, so you can try each one and keep your own choices. See Presets, artworks and colors.
2. Choose how works are shown
Under Artworks, choose how works are hung (a shadow, a mat, a frame, or flat), how grids arrange them, and the caption under each work. Plinth shows the artist and date by default.
3. Describe works so their labels fill in
The wall label beside each work reads Dublin Core values: Creator, Title, Date, Medium, Extent (dimensions), Provenance (the credit line), Identifier (the accession number) and Abstract or Description (the label text). Link Creator to an item for each artist, give that item the artist's dates as its Date, and the label shows them under the name. See Item pages and wall labels.
4. Add your logo and site icon
Under Header, choose a Logo. Without one, Plinth shows the site's title in the heading font. The same section has the header's layout and color, search and an optional button: see Header, announcement bar and footer. Under Site icon & sharing, choose a Site icon for browser tabs and phone home screens, and a Default sharing image for link previews. See Site icon and sharing.
5. Fill in the announcement bar and footer
Add a short notice to the Announcement bar if you have one, such as opening hours or a new exhibition. In Footer, add your address and hours, social media links, and your contact, accessibility and privacy pages.
6. Build your home page
Give the home page the Landing page template, then add blocks: a hero banner for the current exhibition (its words sit on a label in the corner), image cards for your exhibitions, and a browse preview of works from the collection. See Page templates and Block templates and sections.
7. Check the result
Add the Style book template to a private page: it shows your colors, a contrast report for every color pair, type, buttons and forms in your settings.