Jobs tab works fine for me.
Third button on the right,
Then punch in whatever you want (LinkedIn suggests job, skill or company - so "engineering manager X", "architect X", or something like that for me -- whereas X is the specific area i am interested in)
The area the company should be in -- or close to (city in which you reside by default)
After you hit enter and fetch the results you can fine tune based on radius, date posted, experience level, company. remote yes/no/hybrid and if they support easy apply through LinkedIn.
If you really don't get any hits that way maybe that simply means that particular position isn't open anywhere at this time.
Pro-tip: go through your connections, see who knows someone at a company you would like to work at have them recommend you for the job. Don't spend your time sending cold emails or applying to bs job postings.
LinkedIn has never been that great for "searching" for a job the way you search for things on Google.
If your idea is networking and increasing your visibility to recruiters, you'll get more out of it. Recruiters are maligned. Many companies that are hiring people will create broken processes that are all too happy to reject people. A recruiter gets a commission when you get hired so, unlike many hiring managers, they've got a strong financial incentive to get you on board -- sure there are clueless recruiters who will waste your time but the right recruiter is your greatest ally.