When selecting a blank floorplan, what feature is NOT available?

When selecting a blank floorplan, the feature that is not available is the ability to use shapes other than square or rectangular. Blank floorplans are typically designed with a fundamental structure that encompasses either squares or rectangles for simplicity and ease of layout. This geometric limitation allows planners to create clear, organized layouts that are easy to understand and execute.

In contrast, the other features such as the use of custom sizes, selecting furniture arrangements, and adding images or logos are common functionalities in floorplanning tools. Custom sizes enable planners to modify the dimensions of the floorplan as per venue requirements, while furniture arrangements allow for strategic planning of space usage. Additionally, the incorporation of images and logos helps in branding and personalizing the event layout, enhancing visual representation for stakeholders. Thus, the inability to utilize shapes outside of the basic square or rectangular form is key to maintaining structure and clarity in blank floorplans.