Ah! Now I get it ;)
That indeed is possible. I already have such a filter to remove other "garbage".
This can be configured through the property:
workbench.db.oracle.exclude.tables
The default is:
workbench.db.oracle.exclude.tables=^BIN\\$.*|^MLOG\\$.*|RUPD\\$.*|^SYS_IOT_OVER.*
So if you want to add more expressions, you need add that line to your workbench.settings:
workbench.db.oracle.exclude.tables=^BIN\\$.*|^MLOG\\$.*|RUPD\\$.*|^SYS_IOT_OVER.*|^(?!DR\\$)
Note that you need to escape the backslash. The \\ is intentional!
If you edit workbench.settings, make sure you close SQL Workbench before doing so.
Thomas