Bend data studio to your will with "photoshop" layers or How to freeze Table rows
Here is a short article on how to freeze top rows in Google Data Studio with Tables. The fix itself might be quickly outdated but the solution is interesting as it shows how to play with “layers” to bend Data Studio to your will.
The issue When you create a table in Google Data Studio, there is no way (yet!) to freeze the first row. I’m not talking about the header of your table but the first “real” row.