Hi Oleg,
Greetings from the Syncfusion support.
We have validated your query with provided information and we suggest you to use actionBegin event with requestType of columnstate while column show/hide action in Grid using Columnchooser. Please refer the below code example and sample for more information.
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[App.Vue]
methods: {
actionBegin: function(args){
if(args.requestType === "columnstate"){
// Write your code here while show/hide Grid column(s) through ColumnChooser
}
},
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Please get back to us, if you need further assistance.
Regards,
Balaji Sekar