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Hopefully in the future you will install a quality theme so this will not be important.  I'm curious as to your reasons for thinking ps  is best option, and what other ecommerce platforms you investigated.

try this, also not clearing cache is always a good idea, also opening in incognito window for testing most changes.

Check Feature Flag in Database

PrestaShop uses a database table to track enabled features. Sometimes the value does not update properly.

Steps:

• Access your database (via phpMyAdmin or similar).
• Look for the ps_feature_flag table (or similar, depending on your DB prefix).
• Find the row with the name design_section_v2 or similar.
• Set its value to 1 (enabled) or 0 (disabled)

UPDATE ps_feature_flag SET state = 1 WHERE name = 'design_section_v2';