The Project/Order/Quote Search Window can be found when you have your cursor placed inside a Project, Order No. or Quote field and you choose the Search 
button.
Project:
Order:
Quote:
To select a Project/Order/Quote, highlight the Project/Order/Quote and Double-Click on it, or click on the Choose Button.
Choosing Cancel, closes this Search window.
You can also Add or Edit the Project/Order/Quote from this window.