Follow these steps to select the platform:
Select the platform as xilinx_vck190_base_202520_1.
Click Next and review the Summary and then select Finish.
After closing the summary, you can see the Vitis Unified IDE. Review the following:
New AIE Component named as
aie_ssr_lt1Design files under Sources
data folder under Sources
Flow Navigator
AI Engine Component Settings
Selected Platform listed here