Go to Backhouse
Click Bookings on the left side
Switch to Cover Photo Settings
To edit company page photo> Cover Photo Settings for Grouped Branches Web Page ; to edit branch page photo > Store/Branch Cover Photo Settings
Click Select the images to upload photo
Click Save
Kind reminder:
The number of photo is not limited.
The picture scale should be 5:2 horizontal.
And the dimension of photos is suggested more than 1140x256px.
Company cover photo sample:
Branch cover photo sample: