Extend click area seems to been added in v1.60 along with support of LVGL 9.x.
Although there is a similar command available for LVGL 8.3.11, SLS 1.61 does not implement it and export it correctly. Can you add this functionality in the next version? So far I have been unable to use LVGL9.3 in my RP2040 design due to memory issues.