Feel free to go there. There’s no way it can switch off spontaneously. The only two ways are for someone to go to the dialog Dan mentioned and manually switch it off, or to write a macro to do so (just about anything that can be set as a preference in Multi-Edit can be set from within a macro).
That particular value can be changed in a macro by accessing the string global #TABBARSETTINGS and parsing out the /EN= substring. Its possible values are:
[list:3eos1a9x]1 = Off
2 = Top
3 = Bottom[/list:u:3eos1a9x]
For info on how to do such a thing, read the sections of the CMac help concerned with global variables, and have a look at DBTools.s. Dan also recently posted a reply to another question regarding the database functionality you might find useful.