The "Select All" Menu is used for selecting all objects on the screen.
However, if the selected objects are restricted by a Filter, etc., all objects that can currently be selected will be selected.

Select All

The following will explain how to use this function.

Method 1: Select Menu [Edit] => [Select All]
Method 2: Press the Shortcut Key "Ctrl+A"

To cancel the selection, press the "esc" key from the keyboard.