Remove Inbox limit for personal/shared Views (50 inboxes)

We connect Front to a bunch of Slack channels, an individual channel for every big client. There is a separate inbox for each channel, so far so good. Now, we use "Unassigned" view to see tickets that have "Unassigned" tag, as well as other view that should include all inboxes. Unfortunatelly there is no option to just select all inboxes at once for that view so we select new channels manually, which is slightly inconvenient but ok.

Now, it appears there is a limit of 50 inboxes that can be selected there, which is quite problematic. Is there a chance this limit is actually quite random and easy to remove on your side?