The second time it appears, you can uncheck "Show this every time" in the lower left corner and then click "New Document".
...or you could click Save on the first dialog and then click " Thanks!". You'll get the same dialog as above when you'd have closed it with the button in the corner.
For inkscape, some of the more sophisticated generative things were "use and forget" for me but they have actually improved to be much more intuitive. The main thing I lose is some of the natural touch that makes it so fast to use. I do love when I use it regularly because it's so quick to pump about svgs at the speed of thought.
Getting really good at a vector tool is such a valuable life skill for explaining all manner of tricky things whether it's for UI mockups, software architecture or graphic design stuff like logos/t-shirt/marketing designs. I live for the "how on earth have you done this?" reaction when I can create a quality diagram while on a call with people. It can really enrich the quality of interactions and reduce cycle time to create designs in real time.
I also use it for all sorts of personal stuff like interior design, DIY, scaffolding etc. I've even submitted official architectural plans I made with it. It's as valuable as a spreadsheet.
Sorry.