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How to implement select all disselect all in lightning-dual-listbox in LWC
How to implement select all disselect all in lightning-dual-listbox in LWC
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Check below examples that can help you.
https://www.salesforcecodecrack.com/2019/03/dual-list-box-component-in-lightning.html
https://www.biswajeetsamal.com/blog/tag/duallistbox/
Thanks,