Fixed the issue.

Ashna-Jahan · web-flow · commit d904436ab74f · 2019-12-04T13:39:27.000+05:30
diff --git a/app/design/adminhtml/Magento/backend/web/css/source/forms/fields/_control-table.less b/app/design/adminhtml/Magento/backend/web/css/source/forms/fields/_control-table.less
@@ -238,12 +238,20 @@
     }
 }
 
-.product_form_product_form_advanced_pricing_modal .admin__fieldset > .admin__field > .admin__field-control {
-    width: calc(~"(100%) * 0.57 - 30px");
+.product_form_product_form_advanced_pricing_modal .admin__fieldset > .admin__field > .admin__field-label, .product_form_product_form_advanced_pricing_modal [class*='admin__control-grouped'] > .admin__field:first-child > .admin__field-label {
+    margin-left: 0;
+}
+
+.product_form_product_form_advanced_pricing_modal .admin__control-table td,
+.product_form_product_form_advanced_pricing_modal .admin__control-table th {
+    padding: 1.3rem 0.7rem 1.3rem 0.3;
+    overflow-y: visible;
+}
+.product_form_product_form_advanced_pricing_modal .admin__fieldset {
+    margin: -40px;
 }
 
 .product_form_product_form_advanced_pricing_modal .admin__control-table-wrapper {
     overflow-x: visible;
     overflow-y: visible;
 }
-

Original file line number	Diff line number	Diff line change
`@@ -238,12 +238,20 @@`
`238`	`238`	`}`
`239`	`239`	`}`
`240`	`240`
`241`		`-.product_form_product_form_advanced_pricing_modal .admin__fieldset > .admin__field > .admin__field-control {`
`242`		`- width: calc(~"(100%) * 0.57 - 30px");`
	`241`	`+.product_form_product_form_advanced_pricing_modal .admin__fieldset > .admin__field > .admin__field-label, .product_form_product_form_advanced_pricing_modal [class*='admin__control-grouped'] > .admin__field:first-child > .admin__field-label {`
	`242`	`+ margin-left: 0;`
	`243`	`+}`
	`244`	`+`
	`245`	`+.product_form_product_form_advanced_pricing_modal .admin__control-table td,`
	`246`	`+.product_form_product_form_advanced_pricing_modal .admin__control-table th {`
	`247`	`+ padding: 1.3rem 0.7rem 1.3rem 0.3;`
	`248`	`+ overflow-y: visible;`
	`249`	`+}`
	`250`	`+.product_form_product_form_advanced_pricing_modal .admin__fieldset {`
	`251`	`+ margin: -40px;`
`243`	`252`	`}`
`244`	`253`
`245`	`254`	`.product_form_product_form_advanced_pricing_modal .admin__control-table-wrapper {`
`246`	`255`	`overflow-x: visible;`
`247`	`256`	`overflow-y: visible;`
`248`	`257`	`}`
`249`		`-`