PDF2XL Online Help

Table Toolbar

Undo

Clicking on the button itself will undo the last change; for example, if a column width has been changed, the layout will be reset so the column is back where it was before the change.
Clicking on the drop-down arrow will open the Undo Actions list:

While the list is open, the user can select multiple actions to undo, and they will all be undone at once, instead of having to click on the Undo button again and again.
Only available when at least one change has been performed on the current PDF file's layout.
Keyboard shortcut: Alt+Backspace, Ctrl+Z.

Redo

Clicking on the button itself will redo the last undone change.
Clicking on the drop-down arrow will open the Redo Actions list:

While the list is open, the user can select multiple actions to redo, and they will all be redone at once, instead of having to click on the Redo button again and again.
Only available when at least one change has been undone, and no new changes has been performed afterwards.
Keyboard shortcut: Ctrl+Y.

Clear page layout

Clears the page layout from the currently displayed PDF file, allowing the user to start with the Marking the Table Area again. Only available if at least one PDF file is loaded and if a table or field has already been marked upon it.

This command toggles the currently selected table's header. If it is on, the table will have a header area; if it is off, it won't.
More information about the table header and usage thereof can be found at this help page.