Canonical home page

Hello. I scan the website with an SEO program to identify SEO errors. It says that I have a main page https://gekoms.org/ and it has non-conanical links to https://gekoms.org (without the «/» at the end) in the logo and in the main menu. How critical is this? If I fix this in «Settings — General» https://disk.yandex.ru/i/pcVJomk0A2smLg. How correct is this? Will this action lower my site in search rankings?

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