Snap icons don't appear

Hi, working with V14.1.13.
Suddanly out of nowhere, the icons of snap pints dissappeared. Snap point is identified by popup message ("polovina" means middle) but not a red symbol on place (see attachment)...
I dont know whenever I accidentally hit some unwanted shortcut...

For example see attachment - it is snapped to middle, but there is no "regular red square" in the middle of line

How to turn them on again ?

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