You should configure 'Log File Rotation' to create new files when they get to be over a certain size. You will get multiple files per day. We set ours at 500mb so most editors can read it.
If you are searching the file for specific strings you could configure a rule to match those strings and log to another file. This will very likely create a much smaller file of the items you want to review and keeping the other entries in a 'generic' log file.
If having multiple files isn't an option for your environment(not recommended), you can use a file viewer that handles files over 2gb. This link offers some options for reading very large files - https://www.ghacks.net/2018/02/22/how-to-open-gigabyte-sized-text-files-on-windows.