Toad for SQL Server 5.7. The Data Grid height in 5.7 version is bigger or higher or thicker than 5.6 version and therefore 5.7 shows less data rows. I see less or fewer data rows in 5.7 than in 5.6 version.
Go to Options | Environment | Interface | under "Look and Feel" | change the skin to something else other than "default" i.e. "Lilian" and "Blue office". It will be close to the size and look from the 5.6 version.
Waiting for fix in a future release of Toad for SQL Server.