> ## Documentation Index
> Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Sample 1. Step 8: Test the identifier element
> Test the IDHeader identifier element in Sample 1 by matching the FlexiLayout with each batch image and reviewing results in the Tree of Hypotheses.
To confirm that FlexiLayout Studio reliably detects the image object for the **IDHeader** identifier element, match the FlexiLayout with each image in the batch. Open the images one at a time and select the **Match** command in the **FlexiLayout** menu or the image's shortcut menu.
When the image and its FlexiLayout match successfully, FlexiLayout Studio draws a blue frame around the detected element. The hypothesis it formulates for the **IDHeader** element is marked with 
in the **Tree of Hypotheses**. Click the hypothesis to show its properties in the **Properties** window.
After you review the matching results for all the images, notice that FlexiLayout Studio fails to formulate a hypothesis for the **IDHeader** element on image 2 (marked with 
). The document heading spans two lines on this image, but you described **IDHeader** as single-line text.