I'll just leave a shameless plug for my neovim GUI project here: https://github.com/vhakulinen/gnvim. It has a WIP PR[1] for implementing multigrid support, which would allow features such as scrollbars.
There are many other GUIs too, such as oni/oni2, gonvim, neovim-gtk and neovim-qt. Extensive list can be found here: https://github.com/neovim/neovim/wiki/Related-projects#gui
I'm using vimr [1] and never had issues with it