You can organise your Budget Versions by Creating Groups for them in the Budget Manager Screen:
Navigate to Budgets & Cashflow > Budget Tools > Budget Manager > Create Group
Set the Group name to Archived Budgets
Position it as required, perhaps at the bottom of all of your Groups
Click ADD GROUP
Drag your old Budgets into the Archived Group using the up/down arrows to the left of the Budget name
As an Alternative, you can EXPORT the Budget Versions to Excel, retain them within your Organisation Filing System, and then Delete them from Calxa.