Hi,
If we refer to the documentation of “uifigure” based apps in the section “scrollable” property it has been stated that the components must be to the right and below of the panels, and components to the left and above of the panel are not scrollable.
Please Refer this document for details : Control panel appearance and behavior - MATLAB (mathworks.com)
You can also refer to this MATLAB Answer with similar query related to scrollable property for better visualization of the issue: Toggle Button Group are not scrollable - MATLAB Answers - MATLAB Central (mathworks.com)