The Brand kit block in the Locker experience editor puts your logo, your colours and your corner radius into the locker modal and map. It needs the Standard plan or above. On a lower plan you can still see the preview, but the store keeps the preset look until you upgrade.
Under Logo in modal and map, press Upload logo. It takes a PNG, JPG or WebP of up to 200 KB and refuses anything else. Logo position puts the logo at the Top (the default) or the Bottom.
CTA color is the button colour. Accent and marker color colours the accents and the map markers, so it has to stay readable against a map rather than against your page. Use preset colors puts both back to the values of the visual style you chose, and resets the corner radius with them.
UI rounding is a slider from 4 to 20 pixels. Match it to the corners your own buttons use, so the picker does not look borrowed from another store.
Rather than filling this in by hand, press Match. The app reads your active theme and fills in the CTA colour, the marker colour, the radius and the logo. Anything it cannot find is marked Not detected. Refresh match runs it again after you change your theme. If it comes back empty the panel says why, and you can always set the fields yourself.
Check the result in the preview described in Customise the pickup modal and map, on Desktop and Mobile.
A logo close to 200 KB is usually far larger than it needs to be. A smaller file loads faster for every customer.
If the accent colour disappears against the map, keep the CTA colour and pick a darker accent.
Stuck on any of this? Open the chat in the bottom right corner of the app and we will help you set it up.