Hello - yes, you can change the quality of the export on the SHARE panel - use the dropdown to select different specs / a smaller file size upon export.
In my opinion the software has a very nice UI! And the functions are really nice too! The software is just too expensive, or there is no trial version without a subscription! I think that's very sad!
Yes, Painting Creator is available in the 2018 version. It was updated in the 2019 version, so it may look a bit different! You can find information on the Painting Creator in the VideoStudio User Guide (page 161): help.corel.com/videostudio/en/user-guide/videostudio-2018.pdf
Hello! The tool is available in the 2019 version, but was updated in the 2020 version so it may look a bit different! You can find more tips on working with Painting Creator in VideoStudio 2019 in the user guide, starting on page 177: help.corel.com/videostudio/en/user-guide/videostudio-2019.pdf