Hi JamMasterV,
It’s not a good idea to directly edit the core theme file. If you want to make any changes in the theme code please create child theme and proceed ahead so that your changes will not get lost when you update the theme.
For showing full content in the blog page, you can go through this instruction https://www.themehorse.com/theme-instruction/attitude/#blogpage and select “Blog Full Content Display” template
Rabin
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