To add and format borders to a worksheet,
- select a cell, a range of cells or the whole worksheet,
- open the Cell settings panel by
- tapping the
icon at the top toolbar, or
- tapping the
option in the pop-up menu and choosing the Cell menu item,
- swipe up to see more options and tap the Border style option to open the border parameters panel:
- swipe up to see all the available parameters and specify the border style you wish to apply:
- tap the Color option and select the necessary border color from the Theme colors or Standard colors palette or create your own Custom color. Return to the previous screen using the
arrow on the left.
- tap the Size option and select the necessary border width: Thin, Medium or Thick. Return to the previous screen using the arrow on the left.
- select one of the available border templates:
No Border, 
All Borders, 
Bottom Border, 
Top Border, 
Left Border, 
Right Border, 
Inside Borders, 
Inside Vertical Borders, 
Inside Horizontal Borders, 
Diagonal Up Border, 
Diagonal Down Border.
- return to the previous screen by tapping the arrow on the left and сlose the cell settings panel by tapping the
icon on the right.