How do I set Dopus to be able to see hidden files?
There should be some function in your default toolbars to show all hidden items. Or you can make a button using following code:
<?xml version="1.0"?>
<button backcol="none" display="both" textcol="none">
<label>Show all hidden</label>
<tip>Show all hidden</tip>
<icon1>#setattr_h</icon1>
<function type="normal">
<instruction>Set HIDESYSTEMFILES=Toggle INVERT GLOBALHIDEHIDDEN=Toggle INVERT globalhidefilter=toggle INVERT</instruction>
</function>
</button>
Note that this runs something different to Abr's command, which will toggle both hidden and system items. By default, those are separate menu items.
Or turn off the Preferences / Folders / Folder Display / Hide hidden files and Hide protected operating system files options.