Installing a sensor on a sliding glass door can be tricky. Here is a way to do it (make sure gap between sensor and magnet is no more than 1/2")

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Hit logo at bottom right of screen
Enter installer code
System configuration
Right arrow to blank sensor location
Down arrow
(01) entry delay[door]
Down arrow
(0862) dw10
Down arrow
Learn serial (or hit shift then learn)
Pull magnet away from switch to get serial programmed
Down arrow
(0) new equip
Down arrow
Loop (2) 2
Down arrow
(0) disable dialer delay
Down arrow
Voice descriptor ("Insert", enter code; codes:
Down arrow
(1) report enabled
Down arrow
(1) supervised enabled
Down arrow
(01) voice only