Yeah, it’s fine. If that is the part I think it is, it’s a cover for the bottom of your engine - not strictly needed (my previous car didn’t even have one when new).

It somewhat protects your cars nether regions from the m minor damage from rocks and similar, but for the average driver it doesn’t do much - Most debris that would damage your engine would also easily pierce through the cover.

There is an aerodynamic component at play here, but it’s not critical. It might also shield your cars innards and prevent turbulent airflow the reduce noise, but again; not critical