This keyboard layout is designed for the Galaxy Tab S Ultra's like my Tab S8 Ultra, so i don't know how it would perform on smaller models like the plus variant. Download the layout here: https://drive.google.com/drive/folders/1sLSLiAl-Zxt-svVwUu_jB1Mkm9qDWI3l Set the keyboard size to maximum and position to right for it to work perfectly.
So I've recently upgraded from my 2015 ipad pro 128gb to my new galaxy tab s8 ultra 256gb, and pretty much EVERYTHING is better, except the stock keyboard. as you can see in the video, i was absolutely slow on the stock, wide keyboard without any desktop symbol keys in the right, and the keys weren't squared on the max keyboard size, so over a month, i tweaked the keyboard layout by squaring off the keys, adding desktop symbol keys, adding extra keys on the sides, added the undo and redo keys, enlarged the ctrl key and reduced the other symbols key, and most impressively, i used the custom text option in keys cafe that contained stuff like "Luv U", and pushed it to it's absolute limits, by adding actual HTML and CSS snippets!
I basically nested a ton of html and css snippits in the "press and hold" menu, and each key contains up to 13 options, 1 for the key itself, and 12 for the press and hold menu, and I've added 6 snippit keys, making for a total of 78 POSSIBLE OPTIONS! That kevel of customization is absolutely incredible and a major reason why i stick with samsung. I haven't done the JS snippets yet, but so far, it's absolutely netter than the stock keyboard in every possible way!
I designed this keyboard layout for my galaxy tab s8 ultra and other galaxy tab S ultra's, so i don't know how this keyboard layout would perform on smaller models like the galaxy tab s8 plus, but you can make adjustments if necessary.