Bug overview description.
When looking at the forum you can choose which thread categories to show. There is also an <All> button to select all categories, but currently it just goes from viewing one category to showing the selected ones.
This might not even be a bug but it would make sense and be practical to me

What part(s) of the site page(s) are affected?
Forum>select categories

What is the expected behavior?
All check boxes should be checked and all threads, no matter category, should be shown
What actual behavior is given instead?
If just one category is currently shown it will change to showing the selected ones, but it will still not show ALL categories

Time of incident (if applicable).
N/a

Can you reproduce the bug every time?
yes

What steps did you take to replicate this bug?
I've seen it a long time but only just now made a bug report, so different browsers, restarting computer/phone, reloading page
Errors or other messages returned (if any).
N/a