Hi Hassan,
Greetings from Syncfusion support.
We suggest you to apply the below styles to hide the expand icon in DetailTemplate enabled grid.
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<style>
.e-grid .e-detailrowcollapse .e-icons.e-dtdiagonalright.e-icon-grightarrow {
display: none;
}
</style>
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Please get back to us if you need further assistance.
Regards,
Renjith R