How do I stop views from defaulting to last 30 days?

How do I stop views from defaulting to last 30 days?

I'll set the view open tickets (as well as others) to show more than the last 30 days as well as more than 20 tickets and it will work for a while but then again and again defaults back to 30 days. We don't only use tickets for service issues that get resolved quickly and it can cause errors if employees don't see tickets.

Besides, if a ticket is still open, why would you ever want to automatically filter them out of view just because they are older than a certain date?

Lastly, if I create custom ticket views using "age in days" and set it to "less than 90 days" or whatever, will that stop the views from continually defaulting to only the last 30 days?

Thank You