Right-clicking on the Fill Gallery opens the pop-up menu which contains the following options:

Import   Identical to the Import button.

Apply as a Fill   Identical to the Fill button.

Apply as Transparency Identical to the Transparency button.

Download   Downloads the select fill

Remove Section  Identical to the Remove button.

Set page background  Identical to the Background button

(Un)Fold Section  Folds up or unfolds the current section.

Previous Section  Moves to the start of the previous section.

Next Section   Moves to the start of the next section.