If you have just one such formula, simply remove the “$” by editing. If there are many:
Use Find & Replace
with Search in:
Formulas
selected,
Regular expression
not enabled
.
Find
= $RY
Replace
= RY
Replace All
if you actually want the “All”. Otherwise one by one.
If you also need to do it for more than one sheetname in one go you would need to use regular expressions (unfortunately rather complicated if you cannot asssure that sheet names are free of fullstops, apostrophes and the like. ¡¡Never use crazy sheetnames!!)
Regular expression
enabled
now.
Find
= \$((([^\.]+)|('(''|[^'])+'))\.)
(Not the only way top do it!)
Replace
= $1