Today, at the time of writing the second page, you need to first remove the navigation bar to re-add them back, before I was due in the global configuration file (app.json) in, so now you want to configure a single page, to I checked online and found that indeed may be the next, but I found that after you set up does not take effect, so hard to debug, and finally found a version of the problem. Before I used the default version is 2.0.4 version, now replaced by version 2.4.3 has finally resolved.
If there is unsuccessful, you can see if your background and font colors are set to light and the like.