does lunar client have lock slots

[ChocolateBlocks]

i havent played minecraft for like two years and i just logged in today

lunar client has updated and it doesnt seem to have the lock feature anymore. or it was never lunar client that did this? but this reddit thread shows a lunar client user having it:
https://www.reddit.com/r/Minecraft/comments/s06kng/i_need_help_inventory_slot_has_a_lock_on_it_lunar/

idk how to get this

and my old forge doesnt work anymore, it just insta crashes cuz my mods are outdated

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