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I understand what you mean with a multi–select but you need to know the limitations of Joomla.

The exact interface you showed, with multiple checkboxes, can't be made to work. This results in an array of true/false values keyed by the status ID (O, P, C, 1 .. 99) whereas Joomla's Model expects an array of the status IDs to filter by i.e. a list of statuses to include in the output (when none is specified it shows all statuses). The only HTML element that can do that is the multiple selection list.

A regular multiple selection list is very hard to use. You have to CTRL-click (Windows, Linux) / CMD-click (macOS) each individual item. If you forget to hold down CTRL/CMD it will lose your selection. That's why Joomla 4 offers the “fancy select” field — this is literally what it's called, I kid you not! Think about how you select tags or categories in the articles manager. Start typing the name, or select from a drop–down list.

There is, however, one problem with this. You can no longer reload the page on selection. We need a button to apply the filter. This is not a problem in the backend (there's a Filter button anyway) but it could be in the front–end. Then again, most people care about Open tickets assigned to them. I think I will try to pre–filter by Open and implement a multi–select state filter for Assigned tickets. If that works as expected I will use it also on the My Tickets and Category (tickets) views.

Well, that was one longwinded way to tell you that I agree with your feature request and will implement it.

What you experience is the Joomla session timing out, logging you out of the site. Go to your site's Global Configuration and set the session expiration time higher. If your case managers would typically go up to 6 hours with the tab open but not interacting with it set the session timeout to 360 minutes.