.my-panel-class table.x-table-layout {
    width: 100%;
}

or

#my-panel-id table.x-table-layout { width: 100%; }


<style type="text/css">

html,body {

height: 100%;

overflow: auto;

background-color: white;

}

.x-table-layout {

width : 100% !important;

}

</style>

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