https://mendotahearth.com/pdfs/manuals/2016 FV44i Installation and Operating Instructions - 0616.pdf
I'm presuming your concern is with the white appearing metal above the glass, is that correct?
Did you get the warranty information on page 51 of the manual above filled out when the fireplace was installed? Looks like that should have been done along with the appropriate tests to be sure that the unit isn't being overfired and thus getting too hot, which might be an explanation for the bowing you are observing.
I can't really identify the part you are concerned with from the parts illustrated circa pages 46 and so in the manual, nor can I really say what that part is doing based on the picture. But it seems unlikely that it should be bending like that, and since it is bending that implies that something is getting too hot. An overfired burner would be a likely explanation for that, which might imply that the main burner input gas pressure migh be too high and was not checked and adjusted when the fireplace was installed.
I would call the installer and ask them to come out and do the inspection required on the warranty form, and to check and set the main burner gas pressure in particular, and offer any explanations for the bowing they might care to do. Just bending it back so it's straight isn't an acceptabl;e repair, in my view, not unless they identify the reason why it was damaged.
You could hold their feet to the fire (so to speak) and ask them to replace the damaged part if you wish.
I would hold the contractor responsible first, the manufacturer second if you need help building a fire under the contractor (so to speak) to identify and correct the problem.
Mendota ought to be able to tell you which distributor sold the fireplace to your installer, and that distributor ought to help you get the installer motivated to fix the problem if they drag their feet, since they might refuse to sell product to someone doing a poor job of installing and backing equipment they sell. If you supply the model and serial number to Mendota, they ought to be able to tell you the chain of ownership from Mendota to the distributor to the installer to you.
Is there anything else that might suggest that the fireplace is getting too hot? Most fireplaces would have a limit switch that would turn the burner off if it overheats, and then back on again when it cools off. You might notice a pattern of on again off again burner operation if that were happening.