Dear Jordan,
Greetings! Thank you for posting in the Microsoft forum.
When you say you can’t scroll over to the add a bucket button, may I confirm if you can’t scroll using the horizontal bar or using the arrow key on the keyboard?

Please check if you can add a new bucket or scroll over the existing buckets in Planner. For this, go to https://tasks.office.com sign in with your work or school account if required, open any plan, and verify if you can scroll. This will help us confirm if the issue is in the Tasks by Planner and To Do in Microsoft Teams app or Planner itself has this issue.
Besides, please with your colleague to verify if they have the issue.
We will look forward to your reply. Stay safe and stay healthy.
Sincerely,
Neha Singh | Microsoft Community Moderator
The reply was not very helpful. There seems to be an Error with the Horizontal Scroll bar in PLANNER - that it only goes across to a certain extent.
This presents for me when I have a Plan with 11 Buckets.
The Planner view in EDGE only displays the first 5 Buckets Columns, and I can scroll right as far as BUCKET 9, but I cannot see buckets 10 & 11, and cannot access ADD NEW BUCKET - which is still off the far right hand edge of the screen, and not visible.
MS seriously needs to (PLEASE PLEASE PLEASE ) fix the Horizontal Scroll bar - I've seen dozens of times this fault has been reported on forums with no solution other then ZOOMING out (so far that at times you cant read the screen.)
The ADD NEW BUCKET option NEEDS to be on the TOP LINE (next to Board Charts Schedule ... ) so it is ALWAYS ACCESSIBLE.
When I use the TEAM view - I can see the start of the 10th Bucket.
This is a SNAPSHOT of the far right hand EDGE of my Screen - which is as far as the SCROLL bar takes me.
