Answer by C_Hayes · Apr 14, 2020 at 02:25 PM
I had this issue too. The FBX Exporter is still considered a "preview" package so you need to enable preview packages in your projects. Go to your package manager (Window>Package Manager), then click on the Advanced drop-down and make sure "show preview packages" has a check-mark next to it. If show preview packages is not checked, just select it to enable them. Your package list should then update and include the FBX Exporter. Hope this helps.