If you mean the shortcuts on the new tab page,
- In the bottom right corner of the New Tab page, click the pencil
icon.
- In the panel that opens, under Shortcuts, select the number of Shortcut rows you want to see from the drop-down menu.
More info Show more or fewer Shortcuts
If you mean the shortcuts on the new tab page,
* In the bottom right corner of the New Tab page, click the pencil [[Image:Fx141NewTabCustomizeIcon]] icon.
* In the panel that opens, under Shortcuts, select the number of Shortcut rows you want to see from the drop-down menu.
More info [https://support.mozilla.org/en-US/kb/customize-items-on-firefox-new-tab-page#w_shortcuts:~:text=Show%20more%20or%20fewer%20Shortcuts,-In Show more or fewer Shortcuts]