XnView Software

Hello. XnView configuration options is a bit confusing and messy - I'm a tech-savvy and developer myself, but I just spent some five minutes straight fiddling around with the XnView settings, and still couldn't configure it in a way, that every image that I open from Windows Explorer via the doubleclick opens up in a new tab inside the XnView - the furthest I got with this, is to make that only one instance of the XnView can be launched at the same time.

What checkbox options should I set, to make sure that every time I open a image via doubleclick, it opens in a new XnView tab (same window)?
Thanks in advance.

do you use 'only 1 instance'?

Yes. But every time I double-click an image, XnView reloads to open that particular photo. I would prefere that every photo I open just shows up on the separate tab in the same app window (same way as, for example, Google Chrome or SumatraPDF does it).

when you use 'only 1 instance', new picture file will be opened as a new tab in XnView instance