Answered
When using Ipad to use geogebra, especially those which need user to drag points, ipad doesn't work properly, the cursor position (the position my finger touch the ipad) is far away from the real position.
Can the admin of GeoGebra look at this problem?
e.g. https://www.geogebra.org/m/t2w6jhkf
When using ipad, I can't even drag the orange point to resize the square.
But it works on PC (google chrome).
The same question 
Confirmed on my iPad Pro
not confirmed my ipad ios 14.4.1 outstanding update 14.5.1
especially in cas ggb is nearly unusable under ios
Please clear your browser cache and try again - it should work again now
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