This plugin provides the following <Plug> mappings:
<Plug>(tlr-down)
Resize current window downward.
<Plug>(tlr-up)
Resize current window upward.
<Plug>(tlr-left)
Resize current window leftward.
<Plug>(tlr-right)
Resize current window rightward.
If you add the following settings to vimrc, you can resize the window as shown in the Gif above:
nmap <C-Down> <Plug>(tlr-down)
nmap <C-Up> <Plug>(tlr-up)
nmap <C-Left> <Plug>(tlr-left)
nmap <C-Right> <Plug>(tlr-right)