I looked it up but didn’t find any up to date answers. I tried looking through menu button (top right corner) > configure > configure dolphin.
You don’t need to go that deep in the menu: click the top right button → show hidden files. Also, Ctrl-H or Alt-.
In the settings of Dolphin is an option for Dolphin to use a standard template for ALL folders…
However, there’s also the option to allow settings to be unique to individual folders - which I think is better.
So when you go into your ~/.config folder, it’s fine to hide hidden files, because they’re not hidden once you’re inside that folder.
But in your home directory, maybe you don’t want to hide all the hidden folders from there… so you do CtrlH to toggle them.
After this, they’re always shown, and the setting is persistent unless you toggle it off.
The place to find your solution is called ‘Settings’. You can find it many ways:
- Hamburger menu or F10
- Shortcuts…
- KDE fairly standardised shortcuts for settings:
Shortcuts: CtrlAlt❟ (comma)
Main Settings: Ctrl⇧Shift❟ (comma)
On the left, there’s Interfrace, View… VIEW is what you want.
At the top are tabs: General is what you want…
Top item “Display Style” where you can choose:
Remember display style for each folder
So image folders could be set to display thumbnails, document folders can show listings with no hidden (.bak spam) stuff…
Then you can enable hidden where it’s needed.
The next option is ‘common display for all folders’ which will make them all the same… but that generally leads to a lot less convenience - having to switch every time to the view that you want (like Thumbs vs Listing vs Compact) or ‘grouped categories’ - very useful for very mixed folders, separating images/documents etc into their own categories.
This doesn’t set it by default though, which is what the OP is asking. If you want ALL folders to show it by default, then you have to change the setting I described in my post above…