Ok, I should've known this since this is kinda what brought me to this forum as well.
The manual on page 238* reads:
"[IS mode] and [Still photo IS] are not displayed when an IS-equipped lens is attached"
In other words, the only thing you have to worry about is the physical switch on the lens.
Hope this helps.
*R6 manual. R5 manual might have it on a different page.
