When you click that button, your Options panel pops up. You'll see a variety of Options there, including one near the bottom that says "Stick the Dealer". If you do not want to sit at tables using the STD rule, click the "No" radio button next to "Stick the Dealer", and then hit the "OK" button.
After setting this Option, clicking the Euchre game panel will result in being seated only at tables where the STD rule does not apply.
Note that you will still see STD tables in the "list of tables". You have to be more careful when clicking on tables, there!
You can try out the different Options by going to play Euchre at World of Card Games. Let me know what you prefer!