How to remove this button from forum block ?

[hotfilepro]

https://vborg.vbsupport.ru/external/2010/06/64.jpg

Hello,
please tell me how to remove the button above,
thank so much :D

[your24hourstore]

collapsing the sidebar button has been addressed in here somewhere in pages past
sorry don't have time to go looking but the info is here in these pages I think Barbole and boofo both discussed it you may try searching their posts

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also try this close the sidebar and goto home or some other page on navbar

then goto forums and see if its open again, because i think it opens by default anyways. so i dont see why you need it gone?