When a Value is changed in the Grbl Settings Pop-Up and Apply clicked, the value is applied to another Item. For example, when trying to change the setting for Z max rate ($112) the new value is applied to homing feed ($24). This can be observed on the (log?) panel under the Command text box on the main page. Instead of logging a $112="somevalue", the operation $24="somevalue".
When a Value is changed in the Grbl Settings Pop-Up and Apply clicked, the value is applied to another Item. For example, when trying to change the setting for Z max rate ($112) the new value is applied to homing feed ($24). This can be observed on the (log?) panel under the Command text box on the main page. Instead of logging a $112="somevalue", the operation $24="somevalue".