rownames dissapear when changing format

I made a data table from a matrix I created

df_table <- data.table(matrix_df)

I made rownames as following:

rownames(df_table) <- c('BG', '1', '2', '3', '4', '5', '6', 'total')

I plotted the table using

grid.table(df_table, theme = t1)

This worked just fine, but now my problem is that when I want to use a separator in between the thousands, my rownames dissapear, I tried the following:

grid.table(format(df_table, big.mark = "."), theme = t1)

Now I get a table with the thousands separator but without the rownames.

Could anyone help me to fix this problem?

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