@Danie-Bosman,
I used moderator powers to fix your embedded image.
Are the arrows indicatiing Tab characters, or merely indicating where the indents are?
Your drawn red arrows are the View > Show Symbol > Show Indent Guide indicators. They show up whether you are set to spaces or tabs, so it won’t help you determine which you are set to.
OTOH, the related View > Show Symbol > Show Space and Tab do show spaces vs tabs:
126dc4bb-05c5-4be7-aa93-20a8ffd5e33a-image.png
As @Alan-Kilborn said, the long right arrows are tab characters, the mid-dots are space characters.
Unfortunately, your screenshot did not include enough information to tell what language your code is in. Like I said, the screenshot needs to include the status bar to show us that, and you cut it off before the status bar. Your language looks vaguely VisualBasic-like, but that’s just a guess. (Though it’s confusing to me that your tab name claims *.txt, but it’s syntax highlighted like code; have you associated .txt with something other than normal text?)
Anyway, whatever language it’s set to, whether you are willing to show the status bar or not, assuming you can read the status bar yourself, or can look in the Language menu to determine what language is active for syntax highlighting your .txt file with code, you need to click on that language’s entry in the Indent Settings box that lists all the languages, and see what the Indent Using is set to for that language: see whether it’s set to Use default value, in which case it will follow the [Default] settings you show in you screenshot; or it might not have that set, and instead have its own, like Makefile does:
Examples comparing my settings for Visual Basic with Use default value vs Makefile with its own set to use tabs:
Visual Basic
1e2784be-9137-4be5-9b25-e49554bfbb19-image.png
Makefile
2ec29bcd-b77d-4519-9876-c610152b64fa-image.png
update: But given your indication that you seemed to think the guidelines were tab characters (which they aren’t, necessarily), then my guess is that you were just misinterpreting what you were seeing, and this whole time, you really do have spaces where you thought it was still inserting tabs. Again, View > Show Symbol > Show Space and Tab will show you definitively and unambiguously whether the characters are spaces or tabs.