Inconsolata font is not shown as monospaced

Inconsolata, Noto mono and some other fonts may be missing from the default list of the monospaced fonts available for the editor.

Inconsolata family contains only one font style — plain. When bold variant is requested to be rendered, IDE will derive a synthetic bold version of the font, which will not have the same width as the original font. As a result, if a file contains both plain and bold text, font will not effectively be monospaced.

That's why Inconsolata is not listed as a monospaced font. You can still use it if you wish, but if you want to preserve its monospaced property you'll need to use a color scheme in editor which doesn't use bold font at all (default one does). The logic for emboldening a font is implemented in FreeType library, it's not easy to change it.