Auto leveling helps keep images straight. This feature is also applied in vertical shooting.
Select [: Auto level].
Setting [ Auto level] to [Enable] disables the following menu items. Check before shooting, because if they are currently set, they will be changed to another option.
- [Shutter mode]: [Elec. 1st-curtain]
- [Drive mode]:  (High speed continuous +) and  (High-speed continuous) (when [Shutter mode] set to [Mechanical])