I really like easymotion, I've made a remap of leader, leader, 2, f to f (same with F), so it's much better to use that way. The problem is that my screen has 51 lines, and Easymotion takes 100 lines no matter what, and I would like to find a way to lower it to 50

For a better use of "Insearch, Easymotion & Skeak" together:

• / & ? = SEARCH whole file
• f & F = GO to word within the range of the screen (e.g. 50)
• s & S = GO to the nearest word

Solution
I think that adding a limit like. vim.easymotion.linesSearch: 50 on the settings.json, that is gonna look just in a range of 50 or other number of specific lines, e.g:
f = 50 lines forward, F = 50 lines backward

I don't think is that hard to implement, actually I'm not talking about words, is just the lines that is looking for, we don't have a lighspeed motion, but this one can be improved