I've tried using a Keyword field with a List Box or Combo Box LE to select multiple hobbies, but I can only select one choice from the list. (Tried using Ctrl, Shift, Alt to select > 1, but no luck)

TIA,

Yes, you can have multiple entries in Keyword field (without adding any additional LE) from a list using Userselect command. It involves a little code. Let's say the Keyword Element is Hobbies

Hobbies:
Following Code goes in Hobbies LE

=============
On Element Entry Event

var vHobby as String = @UserSelect("Tennis,Golf,Polo")

if Hobbies = "" then
     Hobbies = vHobby

Else if Hobbies <> ""  and @in (Hobbies, vHobby) > 0 then
     
     {
     Hobbies = @Replfir (Hobbies, vHobby + ";", "")
     Hobbies = Hobbies + ";" + vHobby
     }

=============
On Element Immediate Change Event

Hobbies = Hobbies + @Userselect ("Tennis,Golf,Polo")

==============
On Element Exit Event

var vLine as string

VLine = Hobbies
If @Right (vLine, 1) = ";" then
     vLine = @Del (Vline, @len (vLine), 1)

VLine = @replace (vLine, ";", "; ")
vLine = @Replace (vLine, " ;", ";")

While @in (vLine, "  ") > 0
     {
           vLine = @replace (vLine, "  ", " ")
     }

Hobbies = vLine

After selecting first choice from the list, Key in ";", that will popup list again for next choice. Do not worry about formatting at this point. Element Exit event code will take care of that.

Element Immediate Change event code makes editing very difficult if not impossible. Everytime you try to change something, the list of choice will pop-up and make editing challenging.  Remember, <esc> key will temporarily get the list off and use mouse selecting the text to be deleted rather than try to delete it with the keyboard.

I hope this will help.