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I'm using AEM 6.5.7
I just verified with my AEM 18.104.22.168 instance and all the dialog seems to be working fine and the Help, Toggle Full Screen options are also showing.
Can you check if you are getting any console error or anything in the error log while opening the dialog?
Also please check if you are facing the same issue on OOTB components such as any core component or if this is only reproducible on the custom component that you have developed.
Check if you have any errors in the console log. Such errors/issues in dialog mostly happen when some JS breaks for some reason. Do check your browser console and see for any errors. If no errors are there , then we may have to look further.