First, let’s make sure you really want to hide it. It’s where the main content of the document goes. Unless all the content of every page is held in Template Variables or one of the other fields, you need it.
If you have the [[*content]] tag in any of your templates, you definitely need it. The [[*content]] tag is replaced by whatever is in that field.
That said, to hide it, or any other field, Go to Security -> Form Customization.
Click on the default profile and select "Edit."
On the grid that appears, you’ll want two entries:
resource/create
resource/update
The first will affect the form when you create a new resource, the second will apply when you update an existing one.
Click on "Create New Set" to create the two (one may already be there).
Set the action to resource/create or resource/update.
Set the template you want the rule to apply to (this is required at present).
(optionally give a description)
leave the other fields blank.
Click on the "Save" button.
Once the two sets exist, right-click on each one and select "Edit."
Make sure the active checkbox is checked
Make sure the template is set correctly
Scroll down and uncheck modx-resource-content in the Visible column.
Click on the "Save" button.
If you have other templates you want to apply the rule to, you can duplicate the rule and change the template.
Go to Security Flush Permissions on the main menu
Clear the site cache.
Be sure you are testing with a resource that uses the specified template.
That should do it.
