Do I need a designer to make the QR cards for my tables?

No. Settings → Tables & QR ordering → QR design & print pack does it. Pick one of the four colour presets or set your own code colour and background, write the caption under the code, choose Plain, Card or Badge, and tick Show my logo above the code if you want it. The page shows the contrast live and refuses anything under 4 to 1, because a restaurant qr code menu nobody can scan costs a whole print run to discover. Press Download the pack for a ZIP with an A4 PDF, one page per table, plus an SVG and a PNG per table for any printer. The Design & appearance tab in the docs walks through it.