In the pane you want, click/tap the Add Module icon.
Choose the module to add to the current pane.
Hover over the module in the list to expose the bookmark and plus icons.
Click/Tap the plus icon.
You can move the module to a different pane in the current page.
You can hover over the empty area of the action menu bar of the module until the cursor changes to a four-arrow cursor, then drag the module to a different pane.
You can click/tap on the four-arrow icon to expand the Move action menu, which contains the list of panes on the page. Then choose the target pane.