[LH3336]: Section Layout Content Column Checkboxes cannot be ticked

… that is, not by pointing to it with mouse and clicking on it.
section-layout-content-columns.JPG
What works, however, is to click anywhere on the line, then use keyboard: Tab to advance, space bar to toggle the checkbox.

Version: 2.9.0.12 Beta (415053) 64-bit - 21 Dec 2018 on Windows 10 Pro 1803 U.S.

Thanks! This has been filed.