How to set Cloudflare to ONLY work with 1 app?

I am using 24 VPS that I need Permanent and long time solutions for.

I was using Proxifier with Iproyal and its getting costly. So i wouldnt mind paying Cloudflare if it works. I tried using Cloudflare default settings and Its causing a Huge Lag in my VPS.

SO the solution to this lag is that

I only want Cloudflare Warp to be used by X.Synapse.to and everything else will not be touched by Cloudflare. How is this possible in the settings?

anyone can help? im willing to pay to fix tihs issue Thanks!