The Checkbox form element can be used to select multiple options in a group. This is useful if you have a small to medium number of options. For a better usability, make sure that each checkbox option is worded comprehensibly.
Preselect / Disable Checkboxes
In order to preselect or disable checkboxes, open up the checkbox element, scroll to the checkbox options and find the “Sel” (preselect) and “Dis” (disabled) column. Select the relevant checkbox option you want to preselect in the “Sel” column.
Limit Number of Selected Checkboxes
You can also limit the user to select a minimum and maximum number of checkboxes with the min_selectable and max_selectable element options. The max width and height of the image group can be set with the max_width and max_height element option.