Failure to reach the final at the 2024 Olympic Games had been a setback, but a then-world leading jump of 8.23m in January, plus a positive start to the competition in Apeldoorn, Netherlands, had raised expectations in the 29-year-old.
Montler had no need to exert himself in qualifying on Thursday - his first round jump of 8.00m was enough for him to bypass the next two rounds and ultimately qualify in fourth place.
An opening jump of 7.94m put him in second place after the first round in the Final, but fouls on his second a third jumps saw him drop to joint-sixth of the eight finalists.
Jumps of 6.33m and 7.83m in the next two rounds only saw him drop to seventh.
Needing a jump of at least 8.12m in the last round to have a chance of a medal, he could only manage 7.47m, staying in seventh place.
A jump of 8.13m in the last round saw Bulgaria's Bozhidar Saraboyukov take gold, a centimetre clear of Italy's Mattia Furlani and Lester Lescay of Spain, who took silver and bronze, respectively.
Montler remains on three European indoor medals in his career - all of them silver.
Sixth for Pihlstrom as Ingebrigtsen wins again
Samuel Pihlstrom was out to win his first senior medal at a major championships, though had the unenviable task of taking on Norway's Jakob Ingebrigtsen in the men's 1500m Final.
A third-place finish in his heat yesterday had earned himself the chance to compete for the medals.
The 23-year-old's time of 3:40.52 was the sixth-fastest of the qualifiers, but some five seconds shorter of his personal best.
In the Final, he was towards the back of the back for the first few laps, before working his way through the field to briefly lead after 500m.
However, it was not long before Ingebrigtsen hit the front and increased the pace.
The Gothenburg native struggled to maintain the speed set by the world record holder, and ultimately finished sixth in a time of 3:39.07.
Ingebrigtsen won his sixth European indoor title in a time of 3:36.56, ahead of Azeddine Habz of France and Isaac Nader of Portugal.