The pad that you made for your via is large enough for soldering, but the issue here is what you are seeing is the via “tented” by soldermask (the green stuff). If you are having these boards professionally made you would want to select “Do not tent vias” when exporting your gerber files. If you are making the boards by hand and won’t have a soldermask applied, don’t worry about it. You’ll have a decent annular ring to solder to. Also, if you aren’t planning on having soldermask applied to your board, you can turn off “Show solder mask layers” in the 3D viewer display options to better visualize what you will (should) end up with.
Additionally, if you are having these boards professionally made, why are you limiting yourself to 1 copper layer? Most PCB vendors (even the dirt-cheap vendors) won’t charge any less for 1 layer because they start with a double-sided board blank. Check out https://pcbshopper.com/ for pricing options from lots of different vendors.