The Right Theme for Your Site
When I first discovered WonderCMS I looked through the range of themes and got the impression that WonderCMS was conceived with fairly small sites in mind. I say this on the basis that the first three default themes, "Old Default", "Default" and "Essence", all still available to install, as well as the current default theme "Sky", aren't really designed to allow for more than five or six menu options and all lack the ability to produce neatly presented sub-menus.
A good number of the remaining themes are little more than derivatives of the default themes, with differing colour schemes. A third group, mainly produced by external contributors, are technically more advanced, but clearly designed for a particular niche topic or subject area so will not be suitable for most users without significant customisation. Unfortunately, such customisation does require some detailed knowledge of HTML and CSS and, in some cases knowledge of JavaScript and PHP may be needed to achieve the result you have in your mind. A couple of the themes also use packages such as Font Awesome and Bootstrap, so customisation may require a still further level of technical knowledge.
I was hoping to use WonderCMS for a site that would need a multi-level menu system. I was unable to find a theme that could deliver that. That's why I began developing my own. I wanted others to find it useful as well so I made it as easy as possible for the slightly more technical to customise and I built in a number of features that should allow almost users to present their content in a variety of ways.
However, it is worth saying that to take advantage of some of the theme's features you do need a basic understanding of HTML tags. I explain a little about that on the Web Design page. To overcome that issue my plan was to provide the best possible documentation, so ordinary users would be able to change such things as the colour scheme and use sample images to see how to add branding to the site header. The documentation also includes lots of information on how to take advantage of some of the styling built into the theme, so users can do such things as place images, with or without captions, that could appear to left or right but would display full width on phone screens.
If you're looking for a theme that can offer that then It's time to read about the GregCustom theme.