The following issues might cause an example to disappear from the Qt Creator Help mode Examples tab:

• examplesinstallpath is missing from the .qdocconf file for the module. It sets the example installation directory under QT_INSTALL_EXAMPLES
• the \brief command is missing from the example documentation
• an \image is missing from the example documentation
• the examples are not in one folder within the module

To see the broken examples:

1) Start Qt Creator with the following CLI command:
QTC_DEBUG_EXAMPLESMODEL=1 ./qtcreator 2> errors.log
(QTC_DEBUG_EXAMPLESMODEL=1 "Qt Creator.app/Contents/MacOS/Qt Creator" 2> errors.log on OS X)
2) Select Help > Examples > 5.4
3) Search for "broken"