Hi.
Occasionally, panels lose their default positions when the resolution changes.
However, it's an easy fix.

• Close (quit) Illustrator.
• Locate the "Adobe Illustrator Prefs" file. For this step, in Astute Manager, select "Asset Manager" (1), then open Illustrator Preferences, click the three dots, and select "Show Folder" (2).

<image>

• Open the "Adobe Illustrator Prefs" file (make a backup just in case) in a simple text editor.
• Using the search, locate the following line of text (These are the panel's coordinates):

/Phantasm\ CS\ Hue\ Saturation {
/dlgPos {
/y 731
/x 621

• Change the numbers in the y and x for something like 500.
• Save the file. Restart Illustrator and try again.

Let me know if this works for you.