The extension below is for those who are already used to the Delphi-like way where the form editor is exactly where the code editor is and masterfully use the F12 key and switch between one and the other. Install the following package:
dockedformeditor
The dockedformeditor is used in conjunction with AnchorDocking and AnchorDockingDsgn, they together works harmoniously well, very different from the sparta_dockedformeditor which is very buggy. How dockedformeditor you will have the form docked in the same area where the code editor is also located:
One more add-on and the option 'Anchors' which can improve form display with emphasis on positions and anchoring:
ALERT: Never use these packages in conjunction with packages Sparta which has a similar purpose until Lazarus version 2.0, such as sparta_formeditor as this will bring certain instabilities, for example, calling the 'Fields Editor' and she goes behind the IDE and you're clumsily looking for him. The package 'sparta' for this coercion purpose was discontinued, the anchor docking it's a fork of it that has been greatly improved.