Use the Data Depth control in the Capture Mode Settings window (or the Capture data depth property in the ILA Core Properties window) to set the data depth of the ILA core's captured data window. You can set the data depth to any power of two from 1 to the maximum data depth of the ILA core (set during core generation or insertion time).
Note: Refer to the section called Modifying Properties on the Debug Cores for more details on how to
set the maximum capture buffer data depth on ILA cores that are added to the design
using the Netlist Insertion probing flow.
You can also use the set_property Tcl command to change the ILA core data depth:
set_property CONTROL.DATA_DEPTH 512 [get_hw_ilas hw_ila_1]