This question has been answered already and you can find the answers here: https://community.atlassian.com/t5/Answers-Developer-Questions/How-can-I-hide-the-left-sidebar-on-some-pages-when-using-the/qaq-p/562487. There are multiple solutions, from a custom user macro (check the latest version near the bottom), to third-party add-ons.
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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