Its been couple of days since i have not found the solution for this. As there is an option for mat-menu that is overlaptrigger property but there is no property to perform
try updating
.cdk-overlay-pane {
position:absolute;
pointer-events:auto;
box-sizing:border-box;
z-index:1000;
display:flex;
max-width:100%;
max-height:100%;
transform:none !important;
margin-top:22px;
}
which is in @angular\material\prebuilt-themes\indigo-pink.css.
added transform:none !important; margin-top:22px; which is working well for me.