Frequency of Checking for Mail

The “Operations” box is a nuisance preempting whatever other application you are using whenever it pops up. I do not recall this happening very often if at all in the past. There is NOTHING in settings that I can find to select how often the eMClient checks for new mail.

How is that done? Can you cause the action to be background instead of preempting other applications ?

If you are using IMAP or Exchange then the Inbox is synced in real-time. Other email folders as well as calendars and contacts are synced according to the setting specified in Menu > Settings > General > Synchronization:

You can also disable the Operations box from displaying if that is easier for you: