How to make colom for menu like this

I’m having a problem.

I created a row of several columns, intending to use it as a horizontal menu. In the back office, the layout is indeed horizontal, but in the front office, it’s vertical. I’ve tried everything to fix it, but nothing works as expected. I can do this easily with other themes, but here, I don’t understand why it’s not working.

If you have any tips that could help me, thank you in advance.

Best regards