You can remove the Icon Bar and Stat Monitor components permanently. Check for updates with the DarqUI utility and scroll down to Icon Bar. Right-click and Delete. Do the same for Stat Monitor, then restart the game.
There are a number of reasons why a DarqUI setting might not be "sticking" between sessions. When you make a change with the in-game Window Manager, make sure you click the small Save button that appears, and click the OK confirmation popup for each and every change that is saved.
If you log out to Character Select, and then back in on the
same character, recent changes won't appear to be saved. The trigger to load DarqUI settings is when the character name changes. Logging out to Character Select and then back in on the same character doesn't change the name, so your recent changes will seem to be missing.
There are three ways to correct for this. 1) Log out to a different character and then back to the current character. In this case the character name changes, so DarqUI settings from the current session will be loaded. 2) Log all the way out of the game and back in. 3) Use the /loadui command and choose DarqUI from the list that appears. After using /loadui you will need to zone once to settle certain parts of the UI that /loadui fails to display properly.
If your changes are still not saving, go back to the Settings tab of the utility and check the server type dropdown. Choose the correct server type and then click the Reset files button, even if the dropdown already showed the correct server type. Log back in and try changing one setting, then check to see if it "sticks" by using one of the three methods shown above.
Also don't forget that you can make changes from within the utility for almost all settings. Switch the utility to Component Mode and select a character and component to configure. You can see what that looks like on
this page.
Please post again if your changes are still not saving.