Inspect Other Layers tool lets you display the attributes of the custom layers added to your GMS while using the ?custommap URL start parameter. You can costumise the displayed data via the GMS Admin console using the Schema tab of the custom layer Properties. This short guide describes the process.
First, the content of the Inspect window can be controlled by checking and unchecking the Visibility box. This way user can switch off and on the visibility of columns displayed in the inspection box.
Next, users can set the caption which will replace the original column names in the Inspection window.
Lastly, users can change the order in which the information is displayed by rearranging the columns using the arrow buttons on the right side of the Schema window.
Please note that in order for changes to affect the system after the layer properties are applied, the GMS Admin console map needs to be saved, and the GMS User session refreshed.