I figured out that when I change settings in Dolphin that a file called ".directory" gets created in the folder in question to stored said settings. However, I would like to change settings for the user and not per directory. One particular setting of interest is the one to show hidden directories/files. I don't want to have to do it for each directory.
If you want all settings to apply to all folders:
Configure Dolphin... >
Behaviour and select
Use common properties for all folders
This is for Dolphin 4.13.3. It should be similar in KDE 5.