as with any other games released in recent years, "Spyro: Reignited Trilogy" doesn't natively support 5:4 aspect ratio; instead you will get top-n-bottom letterboxes

there is a nifty way to mitigate that issue and play natively in 1280x1024 without any letterboxes

(1) download "Flawless Widescreen". it is a software for launching games in a widescreen mode or changing their FOV

https://flawlesswidescreen.org

(2) download that custom script for "Spyro: Reignited Trilogy"

https://community.pcgamingwiki.com/files/file/1387-spyro-reignited-trilogy-ultrawide-fov-script-for-flawless-widescreen/
mirror: https://drive.google.com/file/d/1PbtSeVhu_atSNuVpAziIBe1STPTrpfJR

(3) unpack the content of script into Flawless Widescreen's folder:

(4) launch Flawless Widescreen and look for "WSGF Plugins" on the left and click on "Spyro: Reignited Trilogy"

(5) click on "fix enabled"

(6) launch the game and Flawless Widescreen will automatically detect the game and fix its aspect ratio for your monitor

(7) in Flawless Widescreen you can also manually change the Field of View (FOV), making it bigger/smaller depending on your taste. you can also use NUM+ and NUM-

if you want to thank me...

...then check my guide about fixing various game issues: launching, crashing, optimization, stuttering, gamepads, etc. the guide is huge, but the topic is broad to begin with
https://steamproxy-script.pipiskins.com/sharedfiles/filedetails/?id=1935376439