Unlike sqlyog, where navicat does not directly display comments, you can view comments by viewing DDL
Ways to view DDL
Open the Navicat tool, double-click to open the database to be connected
Select the table section in the database
Find the table for which you need to view the table creation statement
Right-click the corresponding table, and in the pop-up function list, click Object Information
In the pop-up page, click the DDL tab to view the table creation statement for the corresponding table
For other objects in the database: functions, stored procedures and other creation statements are also viewed in this way, as shown in the figure, how to view functions
Reference from: https://jingyan.baidu.com/article/9989c746dd951ff648ecfec3.html