Relative numbering is not included by default in vim, which means that you probably include it through your ~/.vimrc file or one of your plugins. Search for set relativenumber or set rnu .
To disable it for the current vim session, you simply run set norelativenumber or set nornu for short. This is a common vim template for turning on and off such settings. For example, spell checking set spell for activation and set nospell for deactivation.
To find this information and much more regarding relative numbering, I recommend that you familiarize yourself with the vim help docs. For this case, when in vim run :h relativenumber
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