My “ISO” volume is not visible in “Toolbars”

Help & Support
2

Add that button to your toolbar.

<?xml version="1.0"?>
<button backcol="none" display="both" label_pos="right" textcol="none">
	<label>Other Drives</label>
	<tip>Automatically adds a button for each of the drives in your system to the toolbar/menu</tip>
	<icon1>#drivebuttons</icon1>
	<function type="normal">
		<instruction>Go DRIVEBUTTONS=cdrom,network,removable</instruction>
		<instruction>//,hideempty</instruction>
	</function>
</button>

Or edit the drive button.

https://docs.dopus.com/doku.php?id=customize:creating_your_own_buttons:editing_the_toolbar:field_buttons:drive_list_configuration