Beginner Problem to get a narrow arrow on the side of my dashboard

Hi,

first of, i installed home assistant 2 weeks ago and have come far in those days i think. I was manly focused on adding all my smart homes devices and an 30 year old knx system.
Now I try to get a good looking setup for my Shelly X2 Wall Displays.

I Run it in Full Kiosk Mode And I added a Picture how i want to have my Homescreen Look like. Right now it looks basicly like the picture, just without the arrow button on the left side.

So here is my problem:

I can not get the left arrow, that i want to use for further settings like alarms etc. I want it to be very narrow on the left side of the screen.

I created a Picture for it with exactly the right amount of pixels. But it will always adjust to the other tiles. I tried it with custom layout card, and i can get it to the right size, but it will keep the distance to the other tiles.

Do yoou guys have any advice, what I should try?

just for anyone stumbling uppon this post:

I was abled to find a solution with a grid layout. Even so I have another problem now since it works fine on my smartphone and on my pc, but not on the shelly wall displays where i get the following error