Recently I have been using Debian 9 for some projects rather than my usual CentOS 7 and I have been getting fustrated with vim due to the automatic visual mode which is enabled by default, for most I am sure this is not a problem and if your new to vim then you probabily don't know any differnt (mybe I am showing my age) but I like clasic vim.
It's not a big problem to disable visual mouse mode as you can just enter
set mouse-=a as I use vim a lot I found it better for myslef to change the default for my self by creating a .vimrc file and adding my preferances
Create or edit
~/.vimrc and add
set mouse-=a if you also want to add syntax highlighting also add
set mouse-=a syntax on