products not showing in category on frontend Magento 2, but values are showing in category ()

[dilawarkha038f]

check elastic search is working go stores > configuration>catalog>catalog search then check search engine > if you are using magento 2.4.3 then select elastic search 7 then click on test connection if test connection showing success, it means the elastic search is working. then go to the system>index management and check indexing status. 

if you see any record "reindex required" then run reindex command

bin/magento indexer:reindex

bin/magento cache:clean

bin/magento cache:flush

Now is showing all products in categories pages

[jmilanov]

Having set this:
Set catalog/frontend/list_allow_all to 1
Products were not showing in categories.

Set it back to 0 and everything was fine

[ss89haddadcf05]

I am not a web developer or coder and have no idea what any of the above means however I need to address this issue I am having urgently.

Where do I input the above codes mentioned?

Any help is more than appreciated. Many thanks!