How do I make TextBox work on FE Enabled?

Well the script is:

script.Parent.Changed:Connect(function()
if script.Parent.Text ~= "Full" then 
script.Parent.Text == Ful
end
end)

Well this is a simple script I made.. I need help because it doesn't work on FE Enabled games and I want to get a solution quick

This has nothing to do with FilteringEnabled. Line 3 of your code should be:

script.Parent.Text = "Full"

You forgot to make it into a string.

Hope that helps