No, there's no "merge" function, but it's really not hard to copy one filter, add an "or" to the end of the other one and paste the first one into it.
Or, some add-ons give you a JQL function for "issue in filter (<name other filter>)"
I don't know what you mean by "cross in backlog view"
They ask you to raise an enhancement request at https://support.atlassian.com/contact
But if you do, you'll find it closed as a duplicate. You would be better off voting on the existing ones in https://jira.atlassian.com - I'd expect to find them in the search https://jira.atlassian.com/issues/?jql=project%20%3D%20%22JIRA%20Software%20Server%20(including%20JIRA%20Agile)%22%20and%20text%20~%20%22quick%20filter%22%20and%20text%20~%20merge
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
Every time you release software, there's a bit of risk – that there's a bug, that something breaks, or that the feature doesn't resonate with customers. Feature flagging helps make high stakes s...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs