Which RoboHelp version and which output?
What is the output you are creating? Depending on the output, you may have options. For example, if your output is WebHelp, double-click the Single Source Layout and look at the Navigation section on the left side of the dialog. Note that you are able to select a button, then click the Up or Down buttons to rearrange placement.
Using RH 11 and creating WebHelp output. Yes, that worked perfectly!
Thanks so much!