Instead of right click on the Array to Cluster for Cluster Size, double click will be ease for the programmer to select the size of cluster
Double click should enable this pop up.

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Palanivel Thiruvenkadam | பழனிவேல் திருவெங்கடம்
LabVIEW™ Champion |Certified LabVIEW™ Architect |Certified TestStand Developer
Kidlin's Law -If you can write the problem down clearly then the matter is half solved.
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Available in LabVIEW 2020 and later. Double-clicking the 'Array to Cluster' function will bring up the 'Cluster Size' dialog box.