My checkout is so small

Try this CSS

.tg-site-layout--default #primary {
   width: 100%;
}

To add or override CSS: use the “Additional CSS” option in the customizer. https://codex.www.ads-software.com/CSS#Custom_CSS_in_WordPress

Learn to use the Chrome Developer Tools or Firefox Developer Tools to help you see and test changes to your CSS.

Hi

paste this in css:

.woocommerce-checkout .content-area {
max-width: 80% !important;
margin: 0 auto;
width: 80% !important;
}

if you don’t have access to css then
install custom css plugin use any but i pasted this to help only
(https://www.ads-software.com/plugins/wp-add-custom-css/)

and paste this
you will its box in admin left buttons “Add Custom Css”