How to view all tables in a database
After you open the PL/SQL developer connection on the database, there is an Object browser below the menu Tools to tick it (if it is already ticked off), then there is a objects window on the left side of the IDE, with a tree-shaped structure diagram, Find tables in it. Expand to see all the tables, the default display table includes the system tables and permissions allowed in the scope of the table under other schemas, if you do not want to see, just above the tree graph above the all objects (drop-down box) to my objects Just watch your watch.
Source: http://zhidao.baidu.com/question/319138474.html?loc_ans=815078475
How to switch the SQL window
After you open the PL/SQL developer connection on the database, there is a "window list" under Menu Tools to tick it (if it is already ticked), then there will be a "window List" window in the IDE's interface, you can drag the window to the location you want to specify.
PL/SQL Developer Software Summary----to be continued