How can I create link to open an open/close sidebar

I need a “link” that pressing that link would open the sort of sidebar on the page (to its open “mode”), while still remeining on the main page, like it happens now when we press the “<” arrow on the left. Thanks
I know this is possible because in the past there was on the page a link that did just that, yet when updating the website, got deleted by mistake…(sorry)

Sorry. Solved this. No need to reply/solve. Thanks

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