Display Full Content Instead of Excerpt

General notes:

• it’s not good practice to modify the Parent theme. If the theme gets updated, then your changes will be lost.
• the Child theme is loaded first. Any missing ‘parts’ (like a template) are then loaded from the parent theme. So a page.php in your child theme will be used instead of the parent’s page.php template.

So, if you change the Child page.php, and make a different change to the Parent page.php, the Parent page.php is never called.

You should always make changes to a Child theme. Even if the parent theme is updated, your Child’s code will be used.

If you want things to happen differently in a template, copy the template from the parent, modify things, and then place that file in the Child theme’s folder.