How to get UCSC Genome Browser to show the actual sequence? Is it possible to make UCSC Genome Browser to show the sequence (nucleotide chain) of the current region?

I fiddled with the various viewing options and couldn't figure it out.
If you zoom in at one specific region, it shows the nucleotide chain on the third line (below the chromosome number). It can't be there by default as the size of default region is more than 100,000bp. You can use the scale on the top of the page to see the size of the region.