Hello,
When i do a workout i can`t see all runs on my phone, only appear 4 runs, i get a black zone on the bottom of the screen.
If i scroll up appears the remaining runs, but i can see only 4.
How can correct this? I have a Huawei P7 Lite

If you do not have old activities in your account, then the most probable reason is that you accidentally created a new account, instead of logging into your original one. Try signing out, and signing in back again, using the original credentials. Do not use the Sign Up button! Be sure to use Sign In. Also, before signing out, remove the device from the wrong account, because if the device stays associated with multiple accounts, you will experience data loss when syncing, in future!
OK, I see now. In fact, I haven't seen previously that those are laps/intervals of a single activity, not multiple Run activities. How many intervals of the type "run" are in that activity? Can you see them all when you look at the activity in Garmin Connect Web? Could you share a link to that activity?