Tiling in a level-floor shower

Hm... but that would be even more difficult than my idea? The joint course would then be slanted. Without a slope in the screed, I don’t see where it should come from at all? Therefore, directly to : Did you apply the screed level, or with some slope? If slope, yes, from where at the top to where at the bottom?

Since my channel is basically slanted, I leveled it and pulled the screed from left to back where I am standing and from right to back. I also created a slope from the left towards the channel.

There is a slope. It just needs to be tiled appropriately – I would go for mosaic...

Honestly? Get a professional, anything else will be botched. I don’t see any slope worked into the screed at the laid tile towards the shower to the right and/or to the back at all.
However, it could be deceptive.

Hm... but that would be even more difficult than my idea? Then the grout line would be diagonal.

Without a slope in the screed, I don’t see where it would come from at all?

Therefore, directly to :
So I made a 2% slope towards the shower drain from where I’m standing.

Did you lay the screed level, or with
If slope yes, from where top to where bottom?

Hm... but that would be even more difficult than my idea? Then the grout line would be diagonal.

Without a slope in the screed, I don’t see where it would come from at all?

Therefore, directly to :

Did you lay the screed level, or with some slope?
If slope yes, from where top to where bottom?

Would it maybe be easier to use mosaic tiles since they can be adapted better

Then yes. I missed the screed slope, sorry. So you have a 2% slope from where you stand in the photo diagonally towards the drain? Or straight towards the drain?

The slope is straight towards the channel, so parallel to the wall.