Hi IC,
I am not sure if I understand your scenario, please take a try with the method below and see if it would help:
Change the Visible property of the DropDown control or the TextBox with the formula below:
If(User().FullName="UserFullNmae",true,false)
This will make the control shows out only when the logined user name match the one defined in the formula.
you may also consider switch to
If(User().Email="UserEmailAddress",true,false)
One thing to make sure is the string specified within double quotes must be match the User().Email, as the match is case sensitive.
Adding the function reference:
User function in PowerApps
Please reply back if you need any further assistance.
Regards
Michael
