Question about Panasonic Lumix TZ81

What about RTFM? If you look at the camera back, you will see a lightning symbol on the right-hand side of the setting wheel. Click on it and then the IQ test comes up...

I don't quite understand the question: why should you NOT be able to take photos inside with this camera? If there is enough light, then of course you can. Or you can use the flash, but that's not ideal for showcases and the like. But the camera is quite sensitive to light. Of course, if there is (very) little light (and therefore a longer exposure time), it helps to hold the camera steady, place it somewhere or, ideally, use a tripod. But apart from that, nothing special is necessary.
In automatic mode, it does an automatic white balance. You can also do a white balance manually if necessary, e.g. for coloured light.