hussainsail2002's solution causes cura to produce an invalid configuration issue and forces you to reset cura to defaults.
To fix the Ender 3 disallowed areas issue go to...
C:\Program Files\Ultimaker Cura\resources\definitions
Find...
creality_ender3.def.json
Change (In Notepad++)...
"machine_disallowed_areas": {
"default_value": [
[[-117.5, 117.5], [-117.5, 108], [117.5, 108], [117.5, 117.5]],
[[-117.5, -108], [-117.5, -117.5], [117.5, -117.5], [117.5, -108]]
]},
To...
"machine_disallowed_areas": {
"default_value": [
]},
Save and restart Cura.